driver: vidc: add support for control initialization

Add support for control initialization and set control
implementation. Modified hfi_create_header() and
hfi_create_packet() to handle offset and num_packets
within in the function itself.

Change-Id: If8560be8a884c5df2fcc91f75be90311f1003a41
Signed-off-by: Akshata Sahukar <asahukar@codeaurora.org>
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>

driver/vidc/inc/msm_venc.h

@@ -13,6 +13,5 @@ int msm_venc_s_fmt(struct msm_vidc_inst *inst, struct v4l2_format *f);
 int msm_venc_g_fmt(struct msm_vidc_inst *inst, struct v4l2_format *f);
 int msm_venc_enum_fmt(struct msm_vidc_inst *inst, struct v4l2_fmtdesc *f);
 int msm_venc_inst_init(struct msm_vidc_inst *inst);
-int msm_venc_ctrl_init(struct msm_vidc_inst *inst);
 
 #endif // _MSM_VENC_H_